What are the rates that you see people earning for things like logos, themes, modifications?
Depends how skillful you are. Look on fiverr, it will give you an idea!
Gaming Forum - https://www.joyfreak.com/
it matters how professional a logo or theme you can make. But there are free logo and theme any one can build upon. But, your work is really excellent then you can work as freelancer or get hired.
Nepal https://chatsansar.com
I just paid a guy $300 for some logos and banners along with node icons. Sad fact was he wasn't that very good.
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Depending on your requirements on the logo. I paid $25 for a logo from a logo designer.